Cowper's glands, also known as bulbourethral glands, are a part of the reproductive system in the human body.

The reproductive system is responsible for the production of offspring. It includes various organs and structures that work together to facilitate reproduction. The Cowper's glands are small pea-sized glands located below the prostate gland in males.

Function of Cowper's Glands:
1. Lubrication: The primary function of Cowper's glands is to produce a clear, viscous fluid known as pre-ejaculate. This fluid helps to lubricate the urethra, making it easier for sperm to pass through during ejaculation. It also helps to neutralize any residual acidity in the urethra, providing a more suitable environment for sperm survival.

2. Cleansing: Cowper's glands also play a role in cleansing the urethra. The fluid produced by these glands helps to flush out any urine or foreign particles that may be present in the urethra before ejaculation occurs.

3. Protection: The pre-ejaculate fluid produced by Cowper's glands acts as a protective mechanism. It helps to protect sperm from the residual urine in the urethra, which could be harmful to the sperm cells.

4. Semen Composition: The fluid produced by Cowper's glands contributes to the composition of semen. During ejaculation, the pre-ejaculate mixes with sperm from the testes and seminal fluid from the seminal vesicles and prostate gland to form semen.

Relevance to the Reproductive System:
The reproductive system is responsible for the production, transport, and delivery of gametes (sperm and egg) for the purpose of fertilization. Cowper's glands play a vital role in this process by providing lubrication, cleansing, and protection for sperm.

In conclusion, Cowper's glands form a part of the reproductive system. They contribute to the production of pre-ejaculate fluid, which aids in lubrication, cleansing, and protection of the urethra during sexual activity.